hw/isa-bus.c

   1 /*
   2  * isa bus support for qdev.
   3  *
   4  * Copyright (c) 2009 Gerd Hoffmann <kraxel@redhat.com>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include "hw.h"
  20 #include "sysemu.h"
  21 #include "monitor.h"
  22 #include "sysbus.h"
  23 #include "isa.h"
  24
  25 struct ISABus {
  26     BusState qbus;
  27     qemu_irq *irqs;
  28     uint32_t assigned;
  29 };
  30 static ISABus *isabus;
  31 target_phys_addr_t isa_mem_base = 0;
  32
  33 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent);
  34
  35 static struct BusInfo isa_bus_info = {
  36     .name      = "ISA",
  37     .size      = sizeof(ISABus),
  38     .print_dev = isabus_dev_print,
  39 };
  40
  41 ISABus *isa_bus_new(DeviceState *dev)
  42 {
  43     if (isabus) {
  44         fprintf(stderr, "Can't create a second ISA bus\n");
  45         return NULL;
  46     }
  47     if (NULL == dev) {
  48         dev = qdev_create(NULL, "isabus-bridge");
  49         qdev_init_nofail(dev);
  50     }
  51
  52     isabus = FROM_QBUS(ISABus, qbus_create(&isa_bus_info, dev, NULL));
  53     return isabus;
  54 }
  55
  56 void isa_bus_irqs(qemu_irq *irqs)
  57 {
  58     isabus->irqs = irqs;
  59 }
  60
  61 /*
  62  * isa_reserve_irq() reserves the ISA irq and returns the corresponding
  63  * qemu_irq entry for the i8259.
  64  *
  65  * This function is only for special cases such as the 'ferr', and
  66  * temporary use for normal devices until they are converted to qdev.
  67  */
  68 qemu_irq isa_reserve_irq(int isairq)
  69 {
  70     if (isairq < 0 || isairq > 15) {
  71         hw_error("isa irq %d invalid", isairq);
  72     }
  73     if (isabus->assigned & (1 << isairq)) {
  74         hw_error("isa irq %d already assigned", isairq);
  75     }
  76     isabus->assigned |= (1 << isairq);
  77     return isabus->irqs[isairq];
  78 }
  79
  80 void isa_init_irq(ISADevice *dev, qemu_irq *p, int isairq)
  81 {
  82     assert(dev->nirqs < ARRAY_SIZE(dev->isairq));
  83     if (isabus->assigned & (1 << isairq)) {
  84         hw_error("isa irq %d already assigned", isairq);
  85     }
  86     isabus->assigned |= (1 << isairq);
  87     dev->isairq[dev->nirqs] = isairq;
  88     *p = isabus->irqs[isairq];
  89     dev->nirqs++;
  90 }
  91
  92 static int isa_qdev_init(DeviceState *qdev, DeviceInfo *base)
  93 {
  94     ISADevice *dev = DO_UPCAST(ISADevice, qdev, qdev);
  95     ISADeviceInfo *info = DO_UPCAST(ISADeviceInfo, qdev, base);
  96
  97     dev->isairq[0] = -1;
  98     dev->isairq[1] = -1;
  99
 100     return info->init(dev);
 101 }
 102
 103 void isa_qdev_register(ISADeviceInfo *info)
 104 {
 105     info->qdev.init = isa_qdev_init;
 106     info->qdev.bus_info = &isa_bus_info;
 107     qdev_register(&info->qdev);
 108 }
 109
 110 ISADevice *isa_create(const char *name)
 111 {
 112     DeviceState *dev;
 113
 114     if (!isabus) {
 115         hw_error("Tried to create isa device %s with no isa bus present.",
 116                  name);
 117     }
 118     dev = qdev_create(&isabus->qbus, name);
 119     return DO_UPCAST(ISADevice, qdev, dev);
 120 }
 121
 122 ISADevice *isa_create_simple(const char *name)
 123 {
 124     ISADevice *dev;
 125
 126     dev = isa_create(name);
 127     qdev_init_nofail(&dev->qdev);
 128     return dev;
 129 }
 130
 131 static void isabus_dev_print(Monitor *mon, DeviceState *dev, int indent)
 132 {
 133     ISADevice *d = DO_UPCAST(ISADevice, qdev, dev);
 134
 135     if (d->isairq[1] != -1) {
 136         monitor_printf(mon, "%*sisa irqs %d,%d\n", indent, "",
 137                        d->isairq[0], d->isairq[1]);
 138     } else if (d->isairq[0] != -1) {
 139         monitor_printf(mon, "%*sisa irq %d\n", indent, "",
 140                        d->isairq[0]);
 141     }
 142 }
 143
 144 static int isabus_bridge_init(SysBusDevice *dev)
 145 {
 146     /* nothing */
 147     return 0;
 148 }
 149
 150 static SysBusDeviceInfo isabus_bridge_info = {
 151     .init = isabus_bridge_init,
 152     .qdev.name  = "isabus-bridge",
 153     .qdev.fw_name  = "isa",
 154     .qdev.size  = sizeof(SysBusDevice),
 155     .qdev.no_user = 1,
 156 };
 157
 158 static void isabus_register_devices(void)
 159 {
 160     sysbus_register_withprop(&isabus_bridge_info);
 161 }
 162
 163 device_init(isabus_register_devices)